@@ -347,6 +347,53 @@ return
 	}
 }
 
+// FileDiff shows the changes to a specific file in a commit
+func (d *deps) FileDiff(w http.ResponseWriter, r *http.Request, params map[string]string) {
+	name := path.Join(params["category"], params["name"])
+	if d.isNotAllowed(name) {
+		d.Write404(w)
+		return
+	}
+	ref := params["ref"]
+	filePath := strings.TrimSuffix(params["file"], "/")
+
+	path, err := d.GetCleanPath(name)
+	if err != nil {
+		log.Printf("getcleanpath error: %v", err)
+		d.Write404(w)
+		return
+	}
+
+	g, err := git.Open(path, ref)
+	if err != nil {
+		log.Printf("git open error: %v", err)
+		d.Write404(w)
+		return
+	}
+
+	diff, err := g.DiffFile(filePath)
+	if err != nil {
+		log.Printf("git diff error: %v", err)
+		d.Write500(w)
+		return
+	}
+
+	pageData := templates.PageData{
+		Meta:        d.c.Meta,
+		DisplayName: getDisplayName(name),
+		Name:        name,
+		Ref:         ref,
+		Description: getDescription(path),
+		Path:        filePath,
+		Diff:        diff.Diff,
+	}
+
+	if err := templates.CommitPage(pageData, diff).Render(w); err != nil {
+		log.Printf("diff template: %s", err)
+		d.Write500(w)
+	}
+}
+
 func (d *deps) Refs(w http.ResponseWriter, r *http.Request, params map[string]string) {
 	name := path.Join(params["category"], params["name"])
 	if d.isNotAllowed(name) {